diff --git a/CHANGELOG.md b/CHANGELOG.md
index bfb0905..e92cae3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 Contao Extension "hofff/contao-robots-txt-editor"
 -------------------------------------------------
 
+### Version 1.0.0-beta2 (2016-08-31) ###
+- Adds Multi-Site-Installation (see #1)
+- Improves extending `sitemap` section in BE (see #2)
+
 ### Version 1.0.0-beta1 (2016-06-02) ###
 - Initial release
\ No newline at end of file
diff --git a/CT_ROOT/system/modules/hofff_robots-txt-editor/classes/RobotsTxtEditor.php b/CT_ROOT/system/modules/hofff_robots-txt-editor/classes/RobotsTxtEditor.php
index 4a8a279..887c730 100644
--- a/CT_ROOT/system/modules/hofff_robots-txt-editor/classes/RobotsTxtEditor.php
+++ b/CT_ROOT/system/modules/hofff_robots-txt-editor/classes/RobotsTxtEditor.php
@@ -61,17 +61,33 @@ public function importRobotsTxt(\DataContainer $dc)
    */
   public function createRobotsTxt(\DataContainer $dc)
   {
-    $filepath = TL_ROOT . "/" . FILE_ROBOTS_TXT;
-    
-    if (!is_writable($filepath))
-    {
-      return false;
-    } 
+    $filePath = TL_ROOT . "/" . FILE_ROBOTS_TXT;
     
     $objPage = $dc->activeRecord;
-                                           
+        
     if ($objPage != null)
     {
+      if (static::isDomainSpecicCreationAllowed($dc->activeRecord->useDomainSpecificRobotsTxt))
+      {
+        $filePath = TL_ROOT . "/" . static::getDomainSpecificFilePath($dc->activeRecord->alias);
+        
+        // delete the old file, if the alias was changed
+        $objOldPage = \Contao\Database::getInstance()->prepare("SELECT * FROM tl_version WHERE fromTable=? AND pid=? ORDER BY version DESC")
+                                                   ->limit(1)
+                                                   ->execute('tl_page', $dc->id);
+        
+        if ($objOldPage != null && ($strAliasOld = deserialize($objOldPage->data)['alias']) && $strAliasOld!= $objPage->alias)
+        {
+          \Message::addInfo($GLOBALS['TL_LANG']['MSC']['DomainSpecificRobotsTxt_cleared']);
+          $filePathOld = TL_ROOT . "/" . static::getDomainSpecificFilePath($strAliasOld);
+          
+          if (file_exists($filePathOld))
+          {
+            unlink($filePathOld);
+          }
+        }
+      }
+      
       $fileContent = $objPage->robotsTxtContent;
       
       if ($objPage->createSitemap && $objPage->sitemapName != '' && $objPage->robotsTxtAddAbsoluteSitemapPath)
@@ -82,7 +98,7 @@ public function createRobotsTxt(\DataContainer $dc)
         $fileContent .= "Sitemap: " . $strDomain . "share/" . $objPage->sitemapName . ".xml";
       }
       
-      if (file_put_contents($filepath, $fileContent) === FALSE)
+      if (file_put_contents($filePath, $fileContent) === FALSE)
       {
         return false;
       }
@@ -94,4 +110,31 @@ public function createRobotsTxt(\DataContainer $dc)
     
     return false;
   }
+  
+  /**
+   * Checks whether the extension 'htaccess' is installed and active.
+   * @return True, if the extension 'htaccess' is installed and active.
+   */
+  public static function isHtaccessEnabled ()
+  {
+    return in_array('htaccess', \ModuleLoader::getActive());
+  }
+  
+  /**
+   * Checks whether creation of a domain specific robots.txt is allowed.
+   * @param $blnUseDomainSpecificRobotsTxt The value from the DataContainer.
+   * @return True, if the extension 'htaccess' is installed and the parametrized value in the page is checked.
+   */
+  public static function isDomainSpecicCreationAllowed ($blnUseDomainSpecificRobotsTxt)
+  {
+    return static::isHtaccessEnabled() && $blnUseDomainSpecificRobotsTxt;
+  }
+  
+  /**
+   * Returns the file path to the domain specific robots.txt file.
+   */
+  public static function getDomainSpecificFilePath ($strAlias)
+  {
+    return FILE_ROBOTS_TXT_DOMAIN_SPECIFIC_Folder . "/" . FILE_ROBOTS_TXT_DOMAIN_SPECIFIC_PREFIX . $strAlias . FILE_ROBOTS_TXT_DOMAIN_SPECIFIC_SUFFIX;;
+  }
 }
\ No newline at end of file
diff --git a/CT_ROOT/system/modules/hofff_robots-txt-editor/classes/RobotsTxtEditorHtaccessWriter.php b/CT_ROOT/system/modules/hofff_robots-txt-editor/classes/RobotsTxtEditorHtaccessWriter.php
new file mode 100644
index 0000000..5ecb922
--- /dev/null
+++ b/CT_ROOT/system/modules/hofff_robots-txt-editor/classes/RobotsTxtEditorHtaccessWriter.php
@@ -0,0 +1,64 @@
+<?php
+
+/**
+ * Contao Open Source CMS
+ *
+ * Copyright (c) 2005-2016 Leo Feyer
+ *
+ * @package Hofff_robots-txt-editor
+ * @link    https://contao.org
+ * @license http://www.gnu.org/licenses/lgpl-3.0.html LGPL
+ */
+
+
+/**
+ * Run in a custom namespace, so the class can be replaced
+ */
+namespace Hofff\Contao\RobotsTxtEditor;
+
+
+/**
+ * Class RobotsTxtEditorHtaccessWriter
+ *
+ * EventSubscriber to extend .htaccess file
+ * @copyright  Hofff.com 2016-2016
+ * @author     Cliff Parnitzky <cliff@hofff.com>
+ * @package    Hofff_robots-txt-editor
+ */
+class RobotsTxtEditorHtaccessWriter implements \Symfony\Component\EventDispatcher\EventSubscriberInterface
+{
+  /**
+   * {@inheritdoc}
+   */
+  public static function getSubscribedEvents()
+  {
+    return array(
+      \Bit3\Contao\Htaccess\HtaccessEvents::GENERATE_REWRITES => 'generateRewrites',
+    );
+  }
+
+  /**
+   * Generate this sub module code.
+   *
+   * @return string
+   */
+  public function generateRewrites(\Bit3\Contao\Htaccess\Event\GenerateRewritesEvent $event)
+  {
+    $objPages = \Contao\Database::getInstance()->prepare("SELECT alias, dns FROM tl_page WHERE createRobotsTxt = 1 AND useDomainSpecificRobotsTxt = 1 AND published = 1")->execute();
+    
+    while ($objPages->next())
+    {
+      $strRewriteRule = sprintf($GLOBALS['TL_CONFIG']['RobotsTxtEditorRewriteCond'], $this->prepareUrl($objPages->dns))
+                      . "\n"
+                      . sprintf($GLOBALS['TL_CONFIG']['RobotsTxtEditorRewriteRule'], $this->prepareUrl(FILE_ROBOTS_TXT), $this->prepareUrl(RobotsTxtEditor::getDomainSpecificFilePath($objPages->alias)));
+      $pre = $event->getPre();
+      $pre->append(PHP_EOL . $strRewriteRule);
+    }
+  }
+  
+  private function prepareUrl($strUrl)
+  {
+    $strUrl = str_replace('.', '\.', $strUrl);
+    return $strUrl;
+  }
+}
\ No newline at end of file
diff --git a/CT_ROOT/system/modules/hofff_robots-txt-editor/config/autoload.php b/CT_ROOT/system/modules/hofff_robots-txt-editor/config/autoload.php
index cd85e90..c00b6c0 100644
--- a/CT_ROOT/system/modules/hofff_robots-txt-editor/config/autoload.php
+++ b/CT_ROOT/system/modules/hofff_robots-txt-editor/config/autoload.php
@@ -24,5 +24,6 @@
 ClassLoader::addClasses(array
 (
 	// Classes
-	'Hofff\Contao\RobotsTxtEditor\RobotsTxtEditor' => 'system/modules/hofff_robots-txt-editor/classes/RobotsTxtEditor.php',
+	'Hofff\Contao\RobotsTxtEditor\RobotsTxtEditor'               => 'system/modules/hofff_robots-txt-editor/classes/RobotsTxtEditor.php',
+	'Hofff\Contao\RobotsTxtEditor\RobotsTxtEditorHtaccessWriter' => 'system/modules/hofff_robots-txt-editor/classes/RobotsTxtEditorHtaccessWriter.php',
 ));
diff --git a/CT_ROOT/system/modules/hofff_robots-txt-editor/config/config.php b/CT_ROOT/system/modules/hofff_robots-txt-editor/config/config.php
index 6128d49..246981e 100644
--- a/CT_ROOT/system/modules/hofff_robots-txt-editor/config/config.php
+++ b/CT_ROOT/system/modules/hofff_robots-txt-editor/config/config.php
@@ -9,4 +9,21 @@
  * File constants 
  */
 define('FILE_ROBOTS_TXT', 'robots.txt');
-define('FILE_ROBOTS_TXT_DEFAULT', 'robots.txt.default');
\ No newline at end of file
+define('FILE_ROBOTS_TXT_DEFAULT', 'robots.txt.default');
+define('FILE_ROBOTS_TXT_DOMAIN_SPECIFIC_Folder', 'share');
+define('FILE_ROBOTS_TXT_DOMAIN_SPECIFIC_PREFIX', 'robots_');
+define('FILE_ROBOTS_TXT_DOMAIN_SPECIFIC_SUFFIX', '.txt');
+
+/**
+ * Configuration
+ */
+// Rewrite condition and rule (escape % with %% !!!):
+// RewriteCond %{HTTP_HOST} ^(www\.)?domain-a\.tld$
+// RewriteRule ^robots\.txt share/robots_alias\.txt
+$GLOBALS['TL_CONFIG']['RobotsTxtEditorRewriteCond'] = "RewriteCond %%{HTTP_HOST} ^(www\.)?%s$";
+$GLOBALS['TL_CONFIG']['RobotsTxtEditorRewriteRule'] = "RewriteRule ^%s %s";
+
+if (Hofff\Contao\RobotsTxtEditor\RobotsTxtEditor::isHtaccessEnabled())
+{
+  $GLOBALS['TL_EVENT_SUBSCRIBERS'][] = 'Hofff\Contao\RobotsTxtEditor\RobotsTxtEditorHtaccessWriter';
+}
\ No newline at end of file
diff --git a/CT_ROOT/system/modules/hofff_robots-txt-editor/dca/tl_page.php b/CT_ROOT/system/modules/hofff_robots-txt-editor/dca/tl_page.php
index 35fb25c..83bbaed 100644
--- a/CT_ROOT/system/modules/hofff_robots-txt-editor/dca/tl_page.php
+++ b/CT_ROOT/system/modules/hofff_robots-txt-editor/dca/tl_page.php
@@ -16,7 +16,7 @@
 $GLOBALS['TL_DCA']['tl_page']['palettes']['root'] = implode(";", $arrLegends);
 $GLOBALS['TL_DCA']['tl_page']['palettes']['__selector__'][] = "createRobotsTxt";
 
-$GLOBALS['TL_DCA']['tl_page']['subpalettes']['createRobotsTxt'] = "robotsTxtContent";
+$GLOBALS['TL_DCA']['tl_page']['subpalettes']['createRobotsTxt'] = "robotsTxtContent,useDomainSpecificRobotsTxt";
 
 $GLOBALS['TL_DCA']['tl_page']['fields']['createRobotsTxt'] = array
 (
@@ -38,6 +38,14 @@
   ),
   'sql'                     => "text NULL"
 );
+$GLOBALS['TL_DCA']['tl_page']['fields']['useDomainSpecificRobotsTxt'] = array
+(
+  'label'                   => Hofff\Contao\RobotsTxtEditor\RobotsTxtEditor::isHtaccessEnabled() ? $GLOBALS['TL_LANG']['tl_page']['useDomainSpecificRobotsTxt_htaccessInstalled'] : $GLOBALS['TL_LANG']['tl_page']['useDomainSpecificRobotsTxt_htaccessNotInstalled'],
+  'exclude'                 => true,
+  'inputType'               => 'checkbox',
+  'eval'                    => array('tl_class'=>'w50', 'submitOnChange'=>true, 'disabled'=>!Hofff\Contao\RobotsTxtEditor\RobotsTxtEditor::isHtaccessEnabled()),
+  'sql'                     => "char(1) NOT NULL default ''"
+);
 $GLOBALS['TL_DCA']['tl_page']['fields']['robotsTxtAddAbsoluteSitemapPath'] = array
 (
   'label'                   => &$GLOBALS['TL_LANG']['tl_page']['robotsTxtAddAbsoluteSitemapPath'],
@@ -51,6 +59,7 @@
  * Table tl_page
  */
 $GLOBALS['TL_DCA']['tl_page']['config']['onsubmit_callback'][] = array('tl_page_hofff_robots_txt_editor', 'updateRobotsTxt');
+$GLOBALS['TL_DCA']['tl_page']['config']['onsubmit_callback'][] = array('tl_page_hofff_robots_txt_editor', 'updateHtaccess');
 
 /**
  * Class tl_page_hofff_robots_txt_editor
@@ -75,11 +84,15 @@ public function __construct()
    */
   public function modifyPaletteAndFields($dc)
   {
-    $objPage = \PageModel::findById((int) $dc->id);
-
-    if ($objPage != null && $objPage->createSitemap && $objPage->createRobotsTxt)
+    $objPage = \Database::getInstance()->prepare("SELECT * FROM tl_page WHERE id = ?")->execute($dc->id);
+    if ($objPage->next())
     {
-      $GLOBALS['TL_DCA']['tl_page']['subpalettes']['createSitemap'] = $GLOBALS['TL_DCA']['tl_page']['subpalettes']['createSitemap'] . ',robotsTxtAddAbsoluteSitemapPath';
+      if ($objPage->createRobotsTxt)
+      {
+        $GLOBALS['TL_DCA']['tl_page']['subpalettes']['createSitemap'] = $GLOBALS['TL_DCA']['tl_page']['subpalettes']['createSitemap'] . ',robotsTxtAddAbsoluteSitemapPath';
+      }
+      
+      $GLOBALS['TL_DCA']['tl_page']['fields']['dns']['eval']['mandatory'] = $objPage->useDomainSpecificRobotsTxt;
     }
   }
 
@@ -94,7 +107,7 @@ public function updateRobotsTxt(DataContainer $dc)
       $robotsTxtEditor = new Hofff\Contao\RobotsTxtEditor\RobotsTxtEditor();
       if ($robotsTxtEditor->createRobotsTxt($dc))
       {
-        \Message::addInfo($GLOBALS['TL_LANG']['MSC']['robotstxt_updated']);
+        \Message::addConfirmation($GLOBALS['TL_LANG']['MSC']['robotstxt_updated']);
       }
       else
       {
@@ -103,6 +116,14 @@ public function updateRobotsTxt(DataContainer $dc)
     }
   }
 
+  public function updateHtaccess(DataContainer $dc)
+  {
+    if (Hofff\Contao\RobotsTxtEditor\RobotsTxtEditor::isDomainSpecicCreationAllowed($dc->activeRecord->useDomainSpecificRobotsTxt))
+    {
+      $objHtaccess = Bit3\Contao\Htaccess\Htaccess::getInstance();
+      $objHtaccess->update();
+    }
+  }
 
   /**
    * Add a link to the robots.txt import wizard
diff --git a/CT_ROOT/system/modules/hofff_robots-txt-editor/languages/de/default.php b/CT_ROOT/system/modules/hofff_robots-txt-editor/languages/de/default.php
index 9e83ee6..e48a07f 100644
--- a/CT_ROOT/system/modules/hofff_robots-txt-editor/languages/de/default.php
+++ b/CT_ROOT/system/modules/hofff_robots-txt-editor/languages/de/default.php
@@ -1,6 +1,8 @@
 <?php
 
 $GLOBALS['TL_LANG']['ERR']['no_robotstxt_default'] = "Es befindet sich keine <b>" . FILE_ROBOTS_TXT_DEFAULT . "</b> in ihrem Contao Root.<br/>Diese Datei hätte bei der Installation der Erweiterung initial erstellt werden sollen.<br/><br/>Der Import wurde abgebrochen.<br/><br/>Bitte installieren Sie die Erweiterung erneut.";
-$GLOBALS['TL_LANG']['ERR']['robotstxt_not_updated'] = "Die <b>" . FILE_ROBOTS_TXT . "</b> konnte nicht neu geschrieben werden (ggf. ist der Zugriff auf die Datei gesperrt).";
+$GLOBALS['TL_LANG']['ERR']['robotstxt_not_updated'] = "Die " . FILE_ROBOTS_TXT . " Datei konnte nicht neu erstellt werden (ggf. ist der Zugriff auf die Datei gesperrt).";
 
-$GLOBALS['TL_LANG']['MSC']['robotstxt_updated'] = "Die <b>" . FILE_ROBOTS_TXT . "</b> wurde neu geschrieben.";
+$GLOBALS['TL_LANG']['MSC']['robotstxt_updated'] = "Die " . FILE_ROBOTS_TXT . " Datei wurde neu erstellt.";
+
+$GLOBALS['TL_LANG']['MSC']['DomainSpecificRobotsTxt_cleared'] = "Der Seitenalias wurde geändert, deshalb wurde die alte domainspezifische robots.txt gelöscht.";
\ No newline at end of file
diff --git a/CT_ROOT/system/modules/hofff_robots-txt-editor/languages/de/tl_page.php b/CT_ROOT/system/modules/hofff_robots-txt-editor/languages/de/tl_page.php
index 4413612..6e0ec50 100644
--- a/CT_ROOT/system/modules/hofff_robots-txt-editor/languages/de/tl_page.php
+++ b/CT_ROOT/system/modules/hofff_robots-txt-editor/languages/de/tl_page.php
@@ -1,9 +1,12 @@
 <?php
 
 $GLOBALS['TL_LANG']['tl_page']['robotstxt_legend'] = "robots.txt Editor";
-$GLOBALS['TL_LANG']['tl_page']['createRobotsTxt']  = array("Eine robots.txt erstellen", "Eine individuelle robots.txt erstellen.");
-$GLOBALS['TL_LANG']['tl_page']['robotsTxtContent'] = array("Inhalt der robots.txt", "Geben Sie den Inhalt der robots.txt an.");
 
-$GLOBALS['TL_LANG']['tl_page']['robotsTxtAddAbsoluteSitemapPath'] = array("Add absolute sitemap path to robots.txt", "Add the absolute path of the sitemap to the robots.txt");
+$GLOBALS['TL_LANG']['tl_page']['createRobotsTxt']                                 = array("Eine robots.txt erstellen", "Eine individuelle robots.txt erstellen.");
+$GLOBALS['TL_LANG']['tl_page']['robotsTxtContent']                                = array("Inhalt der robots.txt", "Geben Sie den Inhalt der robots.txt an.");
+$GLOBALS['TL_LANG']['tl_page']['useDomainSpecificRobotsTxt_htaccessInstalled']    = array("Domainspezifische robots.txt verwenden", "Wählen Sie, ob die robots.txt domainspezifisch sein soll, d.h. für die Domain dieses Seitenbaums wird eine individuelle robots.txt im <i>share</i> Verzeichnis angelegt und in die .htaccess Datei wird eine entsprechende Rewrite Regel eingetragen.<br/><br/>Erstellt folgenden .htaccess Eintrag (beispielhaft):<br/><br/><i>" . sprintf($GLOBALS['TL_CONFIG']['RobotsTxtEditorRewriteCond'], "domain-a\.tld") . "<br/>" . sprintf($GLOBALS['TL_CONFIG']['RobotsTxtEditorRewriteRule'], "robots\.txt", "share/robots_alias\.txt") . "</i>");
+$GLOBALS['TL_LANG']['tl_page']['useDomainSpecificRobotsTxt_htaccessNotInstalled'] = array($GLOBALS['TL_LANG']['tl_page']['useDomainSpecificRobotsTxt_htaccessInstalled'][0], "Für dieses Feature muss die Erweiterung <i>hofff/contao-htaccess</i> installiert und aktiv sein.<br/><br/>" . $GLOBALS['TL_LANG']['tl_page']['useDomainSpecificRobotsTxt_htaccessInstalled'][1]);
+
+$GLOBALS['TL_LANG']['tl_page']['robotsTxtAddAbsoluteSitemapPath'] = array("Absoluten Sitemap Pfad zu robots.txt hinzufügen", "Den absoluten Pfad der Sitemap zur robots.txt hinzufügen.");
 
 $GLOBALS['TL_LANG']['tl_page']['robotsTxtContentImport'] = array("Default robots.txt importieren", "Die default robots.txt importieren (überschreibt vorhandene Daten).");
diff --git a/CT_ROOT/system/modules/hofff_robots-txt-editor/languages/en/default.php b/CT_ROOT/system/modules/hofff_robots-txt-editor/languages/en/default.php
index a977403..eba4db8 100644
--- a/CT_ROOT/system/modules/hofff_robots-txt-editor/languages/en/default.php
+++ b/CT_ROOT/system/modules/hofff_robots-txt-editor/languages/en/default.php
@@ -1,6 +1,8 @@
 <?php
 
 $GLOBALS['TL_LANG']['ERR']['no_robotstxt_default'] = "There is no <b>" . FILE_ROBOTS_TXT_DEFAULT . "</b> in your Contao root.<br/>This file should be created initially when you installed the extension.<br/><br/>The import was aborted.<br/><br/>Please install the extension again.";
-$GLOBALS['TL_LANG']['ERR']['robotstxt_not_updated'] = "The <b>" . FILE_ROBOTS_TXT . "</b> has not been recreated (possibly, the access to the file is locked).";
+$GLOBALS['TL_LANG']['ERR']['robotstxt_not_updated'] = "The " . FILE_ROBOTS_TXT . " file has not been recreated (possibly, the access to the file is locked).";
 
-$GLOBALS['TL_LANG']['MSC']['robotstxt_updated'] = "The <b>" . FILE_ROBOTS_TXT . "</b> has been recreated.";
+$GLOBALS['TL_LANG']['MSC']['robotstxt_updated'] = "The " . FILE_ROBOTS_TXT . " file has been recreated.";
+
+$GLOBALS['TL_LANG']['MSC']['DomainSpecificRobotsTxt_cleared'] = "The page alias has been changed, so the old domain specific robots.txt was deleted.";
\ No newline at end of file
diff --git a/CT_ROOT/system/modules/hofff_robots-txt-editor/languages/en/tl_page.php b/CT_ROOT/system/modules/hofff_robots-txt-editor/languages/en/tl_page.php
index 356d9be..b161d43 100644
--- a/CT_ROOT/system/modules/hofff_robots-txt-editor/languages/en/tl_page.php
+++ b/CT_ROOT/system/modules/hofff_robots-txt-editor/languages/en/tl_page.php
@@ -1,8 +1,12 @@
 <?php
 
 $GLOBALS['TL_LANG']['tl_page']['robotstxt_legend'] = "robots.txt Editor";
-$GLOBALS['TL_LANG']['tl_page']['createRobotsTxt']  = array("Create a robots.txt", "Create a custom robots.txt file.");
-$GLOBALS['TL_LANG']['tl_page']['robotsTxtContent'] = array("Content of the robots.txt", "Please enter the content of the robots.txt file.");
+
+$GLOBALS['TL_LANG']['tl_page']['createRobotsTxt']                                 = array("Create a robots.txt", "Create a custom robots.txt file.");
+$GLOBALS['TL_LANG']['tl_page']['robotsTxtContent']                                = array("Content of the robots.txt", "Please enter the content of the robots.txt file.");
+$GLOBALS['TL_LANG']['tl_page']['useDomainSpecificRobotsTxt_htaccessInstalled']    = array("Use domain specific robots.txt", "Please select, if the robots.txt should be domain specific, i.e. for the domain of this page tree a custom robots.txt will be created in the <i>share</i> folder and in the .htaccess file a corresponding rewrite rule is added.<br/><br/>Creates the following .htaccess entry (exemplary):<br/><br/><i>" . sprintf($GLOBALS['TL_CONFIG']['RobotsTxtEditorRewriteCond'], "domain-a\.tld") . "<br/>" . sprintf($GLOBALS['TL_CONFIG']['RobotsTxtEditorRewriteRule'], "robots\.txt", "share/robots_alias\.txt") . "</i>");
+$GLOBALS['TL_LANG']['tl_page']['useDomainSpecificRobotsTxt_htaccessNotInstalled'] = array($GLOBALS['TL_LANG']['tl_page']['useDomainSpecificRobotsTxt_htaccessInstalled'][0], "To use this feature the extension <i>hofff/contao-htaccess</i> has to be installed and must be active.<br/><br/>" . $GLOBALS['TL_LANG']['tl_page']['useDomainSpecificRobotsTxt_htaccessInstalled'][1]);
+
 
 $GLOBALS['TL_LANG']['tl_page']['robotsTxtAddAbsoluteSitemapPath'] = array("Add absolute sitemap path to robots.txt", "Add the absolute path of the sitemap to the robots.txt");
 
diff --git a/README.md b/README.md
index b0d0102..101430f 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,7 @@ Provides an editor for auto creation and modification of robots.txt inside a Con
 
 - Define content of robots.txt in root page
 - Add absolute path to sitemap
+- If the extension [hofff/contao-htaccess](https://packagist.org/packages/hofff/contao-htaccess) is installed it is possible to create different custom robots.txt files in a multi site installation.
 
 
 ## Compatibility
@@ -30,6 +31,8 @@ If you prefer to install it manually, download the latest release here: https://
 
 There are no dependencies to other extensions, that have to be installed.
 
+The extension [hofff/contao-htaccess](https://packagist.org/packages/hofff/contao-htaccess) is suggested to use different custom robots.txt files in a multi site installation.
+
 
 ## Screenshots
 
diff --git a/composer.json b/composer.json
index 25ef4c0..1675a2d 100644
--- a/composer.json
+++ b/composer.json
@@ -30,6 +30,9 @@
   "conflict": {
     "contao/core":"3.4.0,3.4.1,3.4.2"
   },
+  "suggest" : {
+    "hofff/contao-htaccess" : "To use different custom robots.txt files in a multi site installation."
+  },
   "extra" : {
      "contao" : {
       "sources" : {
diff --git a/screenshot-backend.png b/screenshot-backend.png
index 267a33a..8c2df57 100644
Binary files a/screenshot-backend.png and b/screenshot-backend.png differ